Rear sight



UUGI Uil Patented Mar. 24, 1936 REAR SIGHT Thomas J. Heavey, United States Army, Fort Riley, Kans.

Application September 11, 1934, Serial No. 743,539

(Granted under the act of March 3, 1883, as

amended April 30, 1928; 370 O. G. 757) The invention described herein may be manu- 6 Claims.

plate I2 with a relatively large aperture I3 factured and used by or for the Government for governmental purposes, without the payment to me of any royalty thereon.

adapted to be in alignment with the aperture IIl is attached to the upper or rear face of the leaf by means of screws I4 passing through the holes v5 This invention relates to a rear sight for guns II and threadedly secured to the plate. The 5 and more particularly it has reference to a sight outer or exposed face of the plate l2 is formed which is to be employed in pointing a gun at with alarge number of radially disposed teeth I5. rapidly moving aerial targets. A bar comprising spaced rails I6-I6 includes The purpose of the invention is to provide a on its lower end a plate I1 which is provided with 10 stro-ng, simple and compact rear sight having a radially disposed teeth I8 adapted to mesh with l0 readily adjustable slide carrying sighting rings. the teeth I5 of the plate I2. The plate I1 is A further object of the invention is to provide a formed with an aperture I9 adapted to be in novel mounting of the sight to enable it to be alignment with the apertures I and I3. The quickly swung about a longitudinally disposed pin bar is pivotally mounted on a longitudinally diswhich is hollow sov as to also serve as a sighting posed hollow pin 20 passing through the aper- 15 aperture. tures I9, I3 and I0. The pin 20 has a head 2| With the foregoing and other objects in View, on one end engaging the plate I1 and is held the invention resides in the novel arrangement against removal by a nut 22 threaded on the and combination of parts and in the details of opposite end. A helical spring 23 surrounding construction hereinafter described and claimed, the pin and confined between the plate I2 and 20 it being understood that changes in the precise the nut 22 normally holds the radial teeth I8 embodiment of the invention herein disclosed and I5 in engagement to maintain the bar in may be made within the scope of what is claimed position of angular adjustment but yields when without departing from the spirit of the invenpressure is applied to' the bar to swing it about 25 tion. the hollow pin 20. 25

A practical embodiment of the invention is The rails I6 of the bar are formed with grooves illustrated in the accompanying drawing, Where- 24 for receiving a slide 25 having a large center in: opening 26 and having at its ends sighting rings Fig. 1 is a View in side elevation of the improved 21 and 28. One of the sides of the slide 25 is rear sight. formed with a series of recesses 29 adapted to be 30 Fig. 2 is a View in rear elevation of Fig. 1. entered by a plunger 30 carried by the bar. The

Fig. 3 is a view in rear elevation with the sight plunger is normally held against the slide by in horizontal position and fully extended. a spring 3| which is retained in place by a screw Fig. 4 is a sectional View on the line 4--4 of 32.

Fig. 3. The ring 21, which is the inner ring when the 35 Fig. 5 is a sectional view on the line 5-5 of slide is assembled to the bar, is inscribed on Fig. 2 with the slide removed. opposite sides with a pair of reference marks Fig. 6 is a detail View of the leaf. 33 and 34 respectively readable against scales Fig. 'l is a detail View of the bar. 35 and 36 inscribed on the spaced rails I6 of the 40 Fig. 8 is a detail view of the slide. bar. The scale 35 is marked 0 to 80 and the scale 40 Fig. 9 is a detail view of the clutch plate. 36 is marked from 80 to 160. These designa- Referring to the drawing by characters of reftions represent angular values in mils between the erenoe there is shown a base 5 having spaced axis of bore and the line of sight passing through apertured ears 6 6 for receiving a horizontally the front sight of the gun. The distance bedisposed hinge p-in 1 on which is mounted a leaf tween the center of the rings 21 and 28 is equal 45 B. This construction is similar to that of a typito 80 mils on the scales so that the reading of the cal rear sight, the leaf being foldable against the reference mark 34 on the scale 3B indicates the base or raised to a vertical position where it is angular displacement of the line of sight passing held by the conventional spring 9. In the presthrough the outer ring 2B.

ent showing convenience has dictated the forma- The sight is intended primarily for machine 50 tion of the leaf 8 by modifying an existing rear guns and is employed in pointing the gun at rapsight. idly moving aerial targets. When the sight is For the purpose in view, the leaf 8 is of small not in use it is folded against the base 5 as length and has a rather large aperture I0 and indicated in dotted lines in Fig. 1. It is brought a number of small holes Il, An annular clutch into operative vertical position as shown in full 55 lines in Fig. 1 by swnging it about the hinge pin 1.

The sight bar is swung to the right or to the left about its pivot 20 depending on the apparent course of the target relatively to the gun and where vertical corrections are to be considered in addition to lateral corrections the sight bar will be at an appropriate angle between the horizontal and the vertical. When the angular lead has been determined by the gunner or announced to him, he moves the slide until one or the other of the reference marks 33 or 34 arein register with the corresponding division of the scales 35 and 3S and then sights through the appropriate ring 21 or 2B.

When lateral corrections to the line of sight are not required the sight bar is moved to the vertical position where the vertical correction is applied in the manner just explained. In the situation where the target is moving direct-ly at the gun the line of sight is taken through the hollow pivot pin 20.

If the gun is also to be employed against ground targets, the usual sight scaled in terms of range will be used in addition to the present one, or the range will be interpreted in terms of quadrant elevation and read on the scales 35 and 35.

I claim:

1. In a rear sight, a base, a leaf pivotally mounted transversely of the base, an apertured plate attached to the base and having radially disposed teeth on its outer face, a bar having an apertured plate with radially disposed teeth adapted to engage the teeth on the plate of the leaf, a hollow pin passing through the aperture-d plates of the bar and the leaf, a nut on the pin, a spring surrounding the pin and confined between the nut and the leaf, a slide carried by the bar and having a pair of sighting rings spaced along its length, reference marks on opposite sides of the inner ring, means for holding the slide in position on the bar, a scale of low angular values on one side of the bar and a similar scale of higher values on the other side of the bar, said rings being spaced a distance 'coordinated with the length of said scales.

2. In a rear sight, a hollow pin serving as a sighting aperture, a bar pivotally mounted on the pin for movement transversely of a line of sight and including spaced rails, a scale of low values on one rail, a scale of higher Values on the other rail, a slide mounted for movement between the rails, a pair of sighting rings on the slide and spaced along its length a distance coordinated with the length of said scales, means for holding the slide in position on the bar, and reference marks on opposite sides of the inner ring and readable against the scales.

3. In a rear sight, a hollow pin serving as a sighting aperture, a bar pivotally mounted on the pin for movement transversely of a line of sight, a slide carried by the bar and having a pair of sighting rings spaced along its length, means for holding the slide in position on the bar and means indicating the displacement of the sighting rings from the axis of the hollow pin.

4. In a rear sight, a pivotally mounted bar, a scale of low Values on the bar, a scale of higher values on the bar, a slide carried by the bar and having inner and outer sighting rings spaced along its length a distance equal to the length of the low value scale, and references on the inner ring of the slide readable against the respective scales.

5. In a rear sight, a base, a leaf pivotally mounted transversely of the base and including an apertured plate having radially disposed teeth on its rear face, a sight bar having an apertured plate with radially disposed teeth adapted to engage the teeth on the plate of the leaf, a hollow pin passing through the apertured plates of the bar and the leaf and serving as a sighting aperture, a nut on the pin and a spring surrounding the pin and confined between the nut and the leaf.

6. In a rear sight, a base, a leaf pivotally mounted transversely of the base and including an apertured plate having radially disposed teeth on its rear face, a sight bar having an apertured plate with radially disposed teeth adapted to engage the teeth on the plate of the leaf, a pin passing through the apertured plates of the bar and the leaf and extending longitudinally of the base whereby the sight bar may be swung transversely of the base, a nut on the pin and a spring surrounding the pin and confined between the nut and the leaf.

THOMAS J. HEAVEY. 

